Female vs Male knee injury

I'm doing a paper in Anatomy & Psysiology class. Could you please, help me to identify why in a case of knee injury the females are somewhat more prone to knee injuries than males? This would exclude football players, who are more often males than females. What difference in the skeletons of females and males might suggest this to me? I appreciate your time on this. I'm doing some research but I haven't really come to any definitive conclusions yet. Thank You, Mrs Mary Leuck